Indirect Voltammetric Determination of Caffeine Content in Coffee with 1,4 -Benzoquinone Modified Carbon Paste Electrode
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Date
1999-06
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Addis Ababa Universty
Abstract
1 ,4-benzoquinone modified carbon paste electrode is used for the determination of caffeine
in coffee by square wave voltammetry, Voltammetric studies showed that the peak current
of l,4-benzoquinone decreases with increasing the concentration of caffeine. The effects of
pH, electrode composition, step potential, pulse amplitude and square wave frequency on
the voltammetric response were thoroughly investigated, and it was found that 1,4-
benzoquinone exhibits excellent behavior, intenns of very well-defined, reproducible
voltammetric peaks for caffeine determination. The results enabled the measurement of the
peak current of l,4-benzoquinone for the determination of caffeine content in coffee.
Promising results were obtained for caffeine determination in real samples
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Keywords
l;4-benzoquinone Modified Carbon